Here is main program showing usage of above methods along with output. TraditionalProcessor.java class TraditionalProcessor implements Processor Classes annotated with annotation scanResult.getClassesWithAnnotation(()) Classes annotated with annotation scanResult.getClassesWithAnnotation(()) Classes annotated with annotation scanResult.getClassesWithAnnotation(()) Classes having field annotated with annotation scanResult.getClassesWithFieldAnnotation(()) Classes having method annotated with annotation scanResult.getClassesWithMethodAnnotation(()) We will use following annotations in our example. Gradle Dependency compile group: 'io.github.classgraph', name: 'classgraph', version: '4.8.46' Annotations and Domain Classes Lets see practical examples and usage of ClassGraph. it can scan both the traditional classpath and the module path, however, the code is also fully backwards compatible with JDK 7 and JDK 8. ClassGraph is fully compatible with the new JPMS module system (Project Jigsaw / JDK 9+), i.e. In this article we will see Java Classpath Scanning using ClassGraph. I like ClassGraph because it performs scanning of classes at byte-code level with parallelism which makes it uber-fast, ultra-lightweight, parallelized classpath scanner and module scanner for Java, Scala, Kotlin and other JVM languages. ![]() This is where classpath scanner libraries come to rescue and one of them is ClassGraph. What if we want to do it in reverse order like in the classpath, find all classes which implements an interface or extends a class, final all classes annotated with certain annotation or to make it more complex find classes which has a field/method annotated with certain annotation. It also allows us to find all annotations of a class, field or method. import static standard Java Class API or Reflection API allows us to find all interfaces/classes implemented/extended by a class/interface. Here, we are using * to import all the static members. In this example, we are using import statement to import static members of the class. In this case, we don’t need to use import statement rather we use direct qualified name of the class. This is alternate way to use static member of the class. import static .* //importing all static member of Math class Example without using static import The second form of static import statement, imports all the static member of a class. import static //importing static method sqrt of Math class To import single static member we can use statement like the below. We can import single or multiple static members of any class. There are two general form of static import statement. Using static import, it is possible to refer to the static member directly without its class name. We all know that static member are referred in association with its class name outside the class. It is used to import static member of a class. Static import is a feature that expands the capabilities of import keyword. java Īfter successful compiling and executing, it will print the following output to the console. To run the class stored into the created sub package, we can use below command. ![]() To compile the class, we can use the same command that we used for package. In this example, we created a package LearnJava and a sub package corejava in the Simple.java file. Note: The standard of defining package is e.g. and put the Input/Output related classes in io package, Server and ServerSocket classes in net packages and so on. ![]() So, Sun has subcategorized the java package into subpackages such as lang, net, io etc. Reader and Writer classes are for Input/Output operation, Socket and ServerSocket classes are for networking etc and so on. These classes represent a particular group e.g. Let's take an example, Sun Microsystem has definded a package named java that contains many classes like System, String, Reader, Writer, Socket etc. It should be created to categorize the package further. Package inside the package is called the subpackage. In this tutorial, we will learn about sub-packages in Java and also about the concept of static import and how it is different from normal import keyword. Connecting to Access using Type-1 Driver.Method Overriding with Exception Handling.Difference between Classes And Interface.
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